Unlike express consent, implied consent is subject to expiry for Canadian contacts only.
Implied consent based on an inquiry automatically expires six months after last obtained.
Implied consent based on a transaction automatically expires two years after last obtained.
There is a third type of implied consent, which does not expire. This implied without expiry setting can be used for existing business relationships, partners, active members of associations, and in other cases where CASL provides an exemption for expiry of consent.
Expiry of implied consent is fully automated, you don't need to manually track and update consent.
Once consent for a contact expires their consent state is changed to "Expired" and they will automatically be excluded from future email campaigns. You can view the breakdown of contacts by consent status in your account.